Furnace



M. FRISCH FURCE Original Filed July 5, 1940 r1 mm r1 Mmmm NTOR @l5 nectionrvith the iaccom-paming Patented Aug. 14, 1945 l 1 Martin Frisch, New york, n'. x., ,assignor ,to rios- :terfWheeler Corporation,

k continuation -uf application serial No. 343,965,

15 ela-img (orfreed-fessi)4 ;..\Ln y the `.operation lof such furnaces insteam generating apparatus, molten :slag -Whichuis-.clefpoSitedcn-.the furnace floonows 4continuel-xslt' :therefrom `:th-rough :a slag discharge opening midway. .between the :f-ront :and rear -Wallsj-.pf the .Y rfurnace,o,r the-discharge .opening maybe -adjas cenit yand,parallel to the ,mear'furnacefwa'l'l;1r The f .refractorylining of .the '.furn'ace floor-faniclztl'ie #marca/t of the discharge opening are @protected from I excessive temperatures aand# the f damaging effect ofthe, molten rslag, :fray`V water rtubes which lexpansion of individual sections of a floor, rather n midinarly 'areclosely spaced :and v,fa-reconnected y.into the boiler -circulation.` zorderitoprotect .the portiens :of these @tubes Awhich ariev dinectly exposed `rtopthe molten slag, sa coatingf vor fencyzforit to loerloated .andwashedaway 'by the .molten-slag. f f i I.

The present invention lmovivders I-mea'ns'v *for re' .taining-1a -coylering ,over the' tubes `of ia'furnace iolkfwingldescription when consideredin Vcon#` ralwi-ng forming aipartithereofandfin which: "aF-ig el l"isxa partial"verticalsectiorial viewy'offa contiimuousrslagging type'. f-urrlrace embody-ing the iatmention;VVV ",.fL 2 is asectonal xof'Fig. 4; v L3 vis :apartial plan raflild."."1f

.viewrtaken ,Online im@ z v j z Aviert -of the invention;

. Fig. 4 ya somewhat enlarged', partial-sectional v view, takenfon linefl of -Fi-g. 1.v Y y :Ret-erringto `the drawing, referencejcharacter iizidesiginates generally a furnace of a'stealn gena epator hafving `one y-or more lcurmars*for burning y afslagforming fuel; The furnace. as sljiovvn.v has substantially shorizontaly refractory floor lportions lsidenwalls and midway between 'they front and rear :furnace walls.

'The :refractory :floor portions areilinedwit-h `closely spaced :parallel mater `'tubes :lr6 and flrl, which :as shown, v.forni part "of-the circulatory system of the :steam -igen- `erarting unit. Below the fslot t5 and in open .communcation therewith, is a water-sealed reserlvoirg'not shown. Directly beneath the straight horizontal portionsv of 'the 'tubes :t6 and lil 'is one lorifmore :layers of interlocking, wedge-shaped cues :1c .and :1c respectively. The individual tiles 'l fare-.free to 4move' relatively to :eac-'h other .in such away that any lexpansion-fof the rfloor is 'absorbedv fby admini-ite vertical displacement of. the .inter- :Ilocking tiles `Without :providing 4spaces for @slag seepage throughthefloor. Such a floor structure takes care of locali-'Zed expansions', `or fthe .than conveying :suoh expansion to theV entire `:floor structure cumulatively, and also `provides a structure in Which relative movement of lthe 'ffloor'units will be such las to maintain 4an essentially slag tightcontact between the units. The tiles may be constructed and arranged as disclosed inv Frisch and 'Wooley Patent No. I1,8965669, Vgranted iFebruaryFi, 1933. Welded to 4the Eupper .portion of the Sexternal'perip'heries of the hor-izontal portionof `the `ffloor Vtubes I6 and -fi -at Widely spacedintervals are a :plurality Aof metallic lugs 211; -These 'lugs arev disposedlinspacedplanes which extend transversely of the tubes and are arranged so that adjacent lugsvon adjacent tubes are in alignment, thus providing a "plurality of damsfspace'd *apart -a 'substantial distance and which `extend transversely of the'tubes for theV tulliwidthof the furnace and parallelto the vslag y i diss-chargeopening. Lugs 2I`gwhich are similar -t'oflugs '20, 'are positioned on kthe curved portion of the Ytubes "|16 and I1 and are disposed in spaced planes thatextend transversely 1of the tubes.'

The arrangement-is such Athat ladjacent lugs on Y adjacent tubes are 'in'a'lignment thus providing a plurality ofjspaced dams on'the curved rportion ofthe tubes. 1A s shown, these `danisaramore widely Aspaced the straight .horizontal lfloor portionspf .thetubes 4Iii .and I1., than they vare on the curved-portions of the tubes which extend into the :throatwof fthe slag discharge opening. Chrome ore or an equivalent heat resisting plastic -rnaterial is inserted vin .the spaces vlcetr've'en floor ytubes and -Iisbuilt up on the-tube surfaces in thekspaoes betweenadacent dams as Shown in thedrawing. A"highly'heat-resi'stingprotecf a-ye-b1an1;e t" or cheating is lthus providedrf'r" the tubesand for yany xportionsfof the refractory of the chrome ore is washed away, as shownl in Fig. 2, it will be replaced/by a layer of slag which freezes in the region adjacent the watercooled surface of the tubes, although the slag is molten thereabove. Such a layer of frozen slag is self-replacing and insulates the tubes-from the flowing molten slag. Thus the dams serve` not only to retain the chrome ore in place, but also act to retard the flow of molten slag ,to a sufflg cient extent to provide a frozen layer of slag adjacent thetube surfaces which aifordsa permanent protection for the furnace floor. The molten slag flows into the discharge opening infa number of streams yand into the watersealedreservoir without touching the exposed sectionslland l1 of the water tubes which. form the lower portion of the throat of the discharge and arebent away lfrom the'throat so as to promote the disengagement ofthe slag from the tube surface. As the radiant heatof the slag streams is absorbed by these tube sections, the slag is chilled and becomes less viscous, stretchinginto threads which freeze as they drop i'nto the water in the reservoir and break up into needles which are sluiced out `at suitableintervals.

vItxwill be? apparent that the invention is not limited `in-'its 'application t0 furnaces of `steam generating apparatus, but that it iis capable of If, due to the constant drag of j `than ,the downwardly extendingwportion than on -the downwardly extending portion, said lugs being so disposed as to provide a plurality of dams extending substantially transversely of the tubes "for retaining a covering of refractory material on said members.

.3. A substantially horizontal furnace floor hav- .'ing `a slag discharge opening therein, said` floor oblique side of van adjacent block, a plurality of general application to furnaces of the slagging vention is disclosed herein,yit is`tov be underl stood that changes-maybe made in the form, location and relative arrangement of the several parts of the apparatus without departing from the principles of the invention, which is not to belimited excepting by the scope of the appended claims. if v. l 'l i vvWhat is claimed is: v

y ,1j A furnaceiioor having a slag discharge opening therein, said floor comprising a pluralityl of blocks inA relatively sliding contact with respect to 4each other, eachof `said blocks having a side in contact with an oblique side of an adjacent block,fluid conducting tubular ymembers lining saidblocks on the, furnace side thereof and extending downwardly through said opening, and lugs secured to the tubular members and spaced axially a substantially greater distance from one another on portions of the tubes other than the downwardly extending portion than on the downwardly extending portion, saidlugs `being so disposed as to provide a plurality of dams extending substantially transversely of the tubes for retaining a= covering of refractory material on said members'.

2; lA furnace floor having a slag discharge opening-therein, said oor comprisinga plurality of blocks in relatively sliding contact with respect tov each other, eachof said blocks having an oblique side in contact with an oblique side of an adjacent block, nuid conducting tubular members lining said blocks on the furnace side therelaterally spaced, substantially horizontally ext tending tubular members disposed on the furnace side of said blocks which members are curved 'adjacent the slag discharge opening to extend downwardly therethrough, means forming a plurality of dams, said dams comprising a plurality of lugs secured to the lmembers in'axially spaced planes and embracing at least a part of the circumference thereof, the lugs on the curved portion of the tubular members being spaced apart axially a predetermined distance and the lugs on the horizontal portion of the members being spaced Vapart axially a distance several times greater than the distance between the lugs on the curved portion, said lugs extending transversely of the members, a portion thereof projectingbeyond the members on the furnace side thereof .and another portion projecting into the space between the members, the lugs being so arranged and Vdisposed on the'members that adjacent lugslon adjacent tubes are in lateral alignment, and a covering of heat resistant plastic material over the members and extending between said ymembers and lsaid dams, the construction andk arrangement being such that the dams will retain the covering of heat resistant material on the horizontal portion of the members and in the event part of said material is eroded by the flowing of :slag thereover will retard the flow of moltenslag sufficiently to forma protective coating over the eroded portion of the covering and prevent furthererosion thereof'.

4. A substantially horizontal furnace floor havingr-a substantially centrally disposed slag discharge opening, said floor comprising al plurality of blocks in relatively sliding contact with respect to each other, each of said blocks having a side in contact with an oblique side of an adjacent blocka plurality of laterally spaced, substantially horizontally extending tubular members disposed on the lfurnace sideof said blocks which members are curved adjacent the slug discharge opening to extend downwardly therethrough, meansforming a plurality of dams, said dams comprising a plurality of lugs secured to the members in axially spaced planesand embracing at least a part of the circumference thereof, the lugs on the curved portion of the tubular members being spaced a predetermined distance axially vand the lugs on the horizontal portion of the members being spaced apart axially a distance several'times greater than the distance between the lugs on the curved portion, said lugs extending transversely of the members, a portion thereof projecting beyond the members on the furnace side thereof and another portion projecting into the space between the members, the lugs being soV arranged andv disposed on the members that adjacent lugs on adjacent tubes are in lateral alignment,A and a covering of heat resistant plastic material over the members and extending between said members and said dams,fthe construction and arrangement being'suchy that the dams will retain the covering of heat resistant material on the yhorizontal portion of the members and in the event part of said material is eroded by theflowing of slag thereover will retard the ow of molten slag sufcientlyto form a v protective coatingover the eroded portion of the covering and prevent further erosion thereof.

5. A furnace oor having a slag discharge opening therein, said floor comprising a plurality of retaining a covering of refractory materiall on said members. A

MARTIN FRISCH. 

